Certain N-5-[4,7-dimethoxy)-6-(monoalkylaminoethoxy, monocycloalkylaminoethoxy, or dialkylaminoethoxy) benzofuranyl], N&#39;-methyl or ethyl ureas

ABSTRACT

Aminoalkoxybenzofurans having the formula ##STR1## wherein ##STR2## are either (1) ##STR3## is monoalkylamino, dialkylamino, cycloalkylamino or heterocyclic amino, or (2) ##STR4## (H, 1, 4-methyl piperazino), ##STR5## is piperidino. The compounds possess antidysrhythmic properties.

This is a division of application Ser. No. 813,357 filed July 6, 1977 now U.S. Pat. No. 4,113,951.

The present invention has as its aim aminoalkoxybenzofurans, the method of their preparation and their application in therapeutics. These compounds correspond more precisely to the formula: ##STR6## in which the whole of the three parameters ##STR7## takes on any one of the following values: ##STR8## WHERE THE ALKYL GROUP COMPRISES 1 OR 2 CARBON ATOMS) IN WHICH CASE ##STR9## represents a monoalkylamino group in which the alkyl group comprises 1 to 3 carbon atoms, a dialkylamino group in which the alkyl groups comprise 1 to 3 carbon atoms, a cycloalkylamino group comprising 5 or 6 carbon atoms or a heterocyclic radical, particularly pyrrolidino, piperidino, hexamethyleneimino, heptamethyleneimino, 4-methyl piperidino, 4-methyl piperazino and 1,2,5,6-tetrahydro pyridino; and ##STR10## (H, 1,4-methyl piperazino), ##STR11## in which cases ##STR12## represents a piperidino radical.

The method of the invention consists:

(a) in treating 5-acetamino 4,7-dimethoxy 6-hydroxy benzofuran of formula: ##STR13## described in French Pat. No. 2,178,815, with a dilute hyrochloric acid solution to obtain the compound: ##STR14## also described in French Pat. No. 2,178,815 which is condensed: on isocyanates of formula:

    R'.sub.4 NCO                                               (IV)

in which R'₄ represents a methyl or ethyl group, in chloroform at room temperature, or

on dimethylcarbamoyl chloride of formula: ##STR15## to reflux in chloroform or in toluene in an autoclave, to obtain compounds of formula: ##STR16## in which the ##STR17## represents a methylamino, ethylamino or dimethylamino group, then in condensing the compounds of formula (VI): - either with chlorated amines of formula: ##STR18## in which ##STR19## represents a dialkylamino group in which the alkyl groups comprise from 1 to 3 carbon atoms, or a heterocyclic radical, particularly pyrrolidino, piperidino, hexamethyleneimino, heptamethyleneimino, 4-methyl piperidino, 4-methyl piperazino and 1,2,5,6-tetrahydro pyridino; and m being equal to 1 or 2, to reflux in acetone or in acetonitrile in the presence of potassium carbonate, which leads to compounds of formula: ##STR20## in which the ##STR21## have the same significance as in formulae (VI) and (VII) respectively, m being equal to 1 or 2;

or with halogenated derivatives of formula: ##STR22## in which m has the value of 1 or 2 at 90° C. in 50% aqueous soda, or halogenated derivatives of formulae:

    Br--CH.sub.2 --(CH.sub.2).sub.m --Cl                       (IX)

or

    Br--CH.sub.2 --(CH.sub.2).sub.m --Br                       (X)

in which m has the value of 1 or 2, to reflux in acetone or acetonitrile in the presence of potassium carbonate; and in reacting on the new compounds thus obtained of formula: ##STR23## in which m has the value of 1 or 2, and the ##STR24## has the same significance as in formula (VI), amines of formula: ##STR25## in which the group ##STR26## has the same significance as in formula (VII) and may moreover represent a monoalkylamino group in which the alkyl group comprises 1 to b 3 carbon atoms and a cycloalkylamino group comprising 5 to 6 carbon atoms, in toluene in an autoclave at a temperature of 100° to 110° C. which leads to compounds of formula: ##STR27## or, when ##STR28## in formula (VI) represents a monomethylamino group, with chlorated amide of formula: ##STR29## to reflux in acetone or acetonitrile in the presence of potassium carbonate to obtain the compound of formula: ##STR30## which is then reduced with the lithium and aluminum hydride, to reflux in tetrahydrofuran, which leads to the compound of formula: ##STR31## (b) or by reacting the compound of said formula (II): with a chlorated amine of formula: ##STR32## to reflux in acetone or acetonitrile in the presence of potassium carbonate, or

with any one of the halogenated derivatives of formulae: ##STR33##

    Br--CH.sub.2 --(CH.sub.2).sub.m --Cl                       (IX)

    Br--CH.sub.2 --(CH.sub.2).sub.m --Br                       (X)

in wich m is equal to 1 or 2, in 50% aqueous soda in the case of the derivative of formula (VIII) and in acetone or acetonitrile in the presence of potassium carbonate in the other cases, and in condensing the compounds thus obtained of formula: ##STR34## with amines of formula: ##STR35## in which ##STR36## has the same significance as in formula (VII) in toluene in an autoclave, which leads to obtaining compounds of formula: ##STR37## in which m is equal to 1 or 2 and ##STR38## has the same significance as in formula (XVI), which is treated with a diluted hydrochloric acid solution to obtain compounds of formula: ##STR39## where m and ##STR40## have the same significance as in formula (XVII), which are reacted: with said isocyanates of formula (IV), in toluene in an autoclave to obtain compounds of formula: ##STR41## in which R'₄ has the same significance as in formula (IV) and ##STR42## has the same significance as in formula (XVIII), and m is equal to 1 or 2, or,

when ##STR43## represents a piperidino radical and m is equal to 1 or 2, with said dimethyl-carbamoyl chloride of formula (V), to obtain the compound of formula: ##STR44## this reaction being carried out in toluene at room temperature. The compound of formula: ##STR45## prepared in accordance with the above method may then be reacted with N-methylpiperazine of formula: ##STR46## to reflux in toluene which leads to the compound of formula: ##STR47##

The following preparations are given solely as examples to illustrate the invention.

EXAMPLE 1: 4,7-Dimethoxy 6-(2-isopropylamino ethoxy), 5-N-methyl carbamoyl amino benzofuran Code number: 770 576 1st Step: 4,7-dimethoxy 5-N-methylcarbamoyl amino 6-hydroxy benzofuran. Code number: 760 945

To a solution of 20.9 g (0.1 mole) of 5-amino 4,7-dimethoxy 6-hydroxy benzofuran in 200 ml of chloroform was slowly added 5.7 g (0.1 mole) of methyl isocyanate. It was stirred at room temperature for 2 hours, then the solvent was evaporated and the residue was crystallized in ether and filtered. 23 g of the desired product were obtained.

Yield: 89%

Melting point: 110° C.

Empirical formula: C₁₂ H₁₄ N₂ O₅

Elementary analysis:

    ______________________________________                                                     C       H         N                                                ______________________________________                                         Calculated (%)                                                                               54.13     5.30      10.52                                        Obtained (%)  54.03     5.36      10.48                                        ______________________________________                                    

2nd step: 6-(2-chloro ethoxy) 4,7-dimethoxy 5-N-methylcarbamoyl amino benzofuran. Code number: 770 653

A mixture of 150 g (0.56 mole) of the compound obtained in the preceding step, 100 ml (1.2 mole) of 2-chloro 1-bromo ethane and 207 g (1.5 mole) of potassium carbonate was brought to reflux for 41/2 hours in 1.4 l of acetonitrile.

It was filtered hot, cooled and the precipitate formed was filtered. 115 g of the desired product were obtained.

Yield: 62%

Melting point: 148° C.

Empirical formula: C₁₄ H₁₇ Cl N₂ O₅

Elementary analysis

    ______________________________________                                                     C       H         N                                                ______________________________________                                         Calculated (%)                                                                               57.53     5.52      9.50                                         Obtained (%)  57.46     5.49      9.48                                         ______________________________________                                    

3rd step: 4,7-dimethoxy 6-(2-isoproylamino ethoxy) 5-N-methylcarbomoyl amino benzofuran. Code number: 770 576

A solution of 11.5 g (0.035 mole) of 6-(2-chloro ethoxy) 4,7-dimethoxy 5-N-methylcarbamoyl amino benzofuran obtained in the preceding step, 8.2 g (0.14 mole) of isopropylamine, 7.5 g (0.05 mole) of sodium iodide and 4.8 g (0.035 mole) of potassium carbonate in 200 ml of toluene was brought to reflux in an autoclave for 15 hours. It was filtered; the filtrate was evaporated and recrystallized in ethyl acetate. 2.2 g of the desired product were obtained.

Yield: 18%

Melting point: 140° C.

Empirical formula: C₁₇ H₂₅ N₃ O₅

Elementary analysis:

    ______________________________________                                                     C       H         N                                                ______________________________________                                         Calculated (%)                                                                               58.10     7.17      11.96                                        Obtained (%)  57.89     7.11      11.86                                        ______________________________________                                    

EXAMPLE 2: 6-(2-diisopropylamino ethoxy) 4,7-dimethoxy 5-N-methylcarbamoyl amino benzofuran. Code number: 770 266

A suspension of 12 g (0.045 mole) of 4,7 dimethoxy 5-N-methylcarbamoyl amino 6-hydroxy benzofuran obtained in the 1st step of example 1, 12 g (0.06 mole) of 2-diisopropylamino 1-chloro ethane hydrochloride and 21 g (0.15 Mole) of potassium carbonate in 100 ml of acetonitrile were brought to reflux for 4 hours. It was filtered, the filtrate was evaporated and the residue recrystallized in a 50/50 mixture of ethyl acetate and isopropylic ether. Thus were obtained 13.5 g of the desired product.

Yield: 77%

Melting point: 142° C.

Empirical formula: C₂₀ H₃₁ N₃ O₅

Elementary analysis:

    ______________________________________                                                     C       H         N                                                ______________________________________                                         Calculated (%)                                                                               61.05     7.94      10.68                                        Obtained (%)  61.22     7.94      10.62                                        ______________________________________                                    

EXAMPLE 3: 4,7-dimethoxy 5-(4-methyl piperazinocarbamoylamino) 6-(2-piperidino ethoxy) benzofuran. Code number: 770 520 1st step: 5-amino 4,7-dimethoxy 6-piperidinoethoxy benzofuran dichlorhydrate. Code number: 740 778

A solution of 25.1 g (0.1 mole) of 5-acetamido 4,7-dimethoxy 6-piperidinoethoxy benzofuran were brought to reflux for 10 hours in 200 ml of 2 N hydrochloric acid. Then it was neutralized with concentrated soda, extracted with ethyl acetate, the solvent was evaporated, the residue was taken up again in acetone and 30 ml of 7 N hydrochloric ethanol were added. It was filtered and recrystallized in ethanol.

Melting point: 203° C.

Yield: 43%

Empirical formula: C₁₇ H₂₆ Cl₂ N₂ O₄

Elementary analysis:

    ______________________________________                                                     C       H         N                                                ______________________________________                                         Calculated (%)                                                                               51.48     6.74      6.91                                         Obtained (%)  51.72     6.63      6.81                                         ______________________________________                                    

2nd step: 4,7-dimethoxy 5-N-methylcarbamoylamino-6-(2-piperidino ethoxy) benzofuran. Code number: 750 819

A mixture of 16 g (0.05 mole) of 5-amino 4,7-dimethoxy 6-piperidinoethoxy benzofuran prepared in the preceding step and 3.2 ml (0.055 mole) of methyl isocyanate were brought to 80°-90° C. for 3 hours, in an autoclave, in 500 ml of toluene. The solvent was evaporated, the oil obtained was crystallized in petroleum ether and recrystallized in isopropylic ether.

Melting point: 120° C.

Yield: 37%

Empirical formula: C₁₉ H₂₇ N₃ O₅

Elementary analysis

    ______________________________________                                                     C       H         N                                                ______________________________________                                         Calculated (%)                                                                               60.46     7.21      11.13                                        Obtained (%)  60.42     7.29      11.30                                        ______________________________________                                    

3rd step: 4,7-dimethoxy 5-(4-methyl piperazinocarbamoyl amino) 6-(2-piperidino ethoxy) benzofuran. Code number: 770 520

A solution of 8.5 g (0.023 mole) of 4,7-dimethoxy 5-N-methylcarbamoyl amino 6-12-piperidino ethoxy) benzofuran obtained in the preceding step and 9.1 g (0.09 mole) of N-methylpiperazine in 100 ml of toluene was brought to reflux for 20 hours. The solvent was evaporated, the residue taken up again in ethyl acetate and washed with water, the solvent was evaporated, the residue was crystallized in ether and recrystallized in ethyl acetate.

Yield: 25%

Melting point: 138° C.

Empirical formula: C₂₃ H₃₄ N₄ O₅

Elementary analysis

    ______________________________________                                                     C       H         N                                                ______________________________________                                         Calculated (%)                                                                               61.86     7.68      12.55                                        Obtained (%)  61.63     7.70      12.33                                        ______________________________________                                    

EXAMPLE 4: 4,7-dimethoxy 5-N-methylcarbamoyl amino 6-(2-piperidino 1-methyl ethoxy) benzofuran. Code number: 770 422 1st step: 4,7-dimethoxy 5-N-methylcarbamoyl amino 6-(1-piperidinocarbonyl ethoxy) benzofuran

A suspension of 13.3 g (0.05 mole) of 4,7-dimethoxy 5-N-methylcarbamoyl amino 6-hydroxy benzofuran obtained in the 1st step of example 1, 12 g (0.068 mole) of 1-chloro-1-piperidinocarbonyl ethane and 13.8 g (0.1 mole) of potassium carbonate in 120 ml of acetonitrile was brought to reflux for 6 hours. Then it was filtered, the filtrate evaporated, the residue taken up again in chloroform and filtered on a silica column. 8.5 g (0.02 mole) of the desired compound were obtained, i.e. a yield of 41%.

2nd step: 4,7-dimethoxy 5-N-methylcarbamoylamino 6-(2-piperidino 1-methyl ethoxy) benzofuran

The compound obtained in the preceding step was dissolved in 50 ml of tetrahydrofuran and the solution obtained was slowly added to a suspension of 2.3 g of lithium and aluminium hydride in 100 ml of tetrahydrofuran. It was brought to reflux for 4 hours, then hydrolized and filtered, the filtrate was evaporated and the residue chromatographed on a silica column.

By elution with chloroform, 5 g of the expected product were obtained which was recrystallized in the 20% ethyl acetate-80% isopropylic ether mixture.

Yield: 50%

Melting point: 147° C.

Empirical formula: C₂₀ H₂₉ N₃ O₅

Elementary analysis:

    ______________________________________                                                     C       H         N                                                ______________________________________                                         Calculated (%)                                                                               61.36     7.47      10.74                                        Obtained (%)  61.15     7.73      10.58                                        ______________________________________                                    

EXAMPLE 5: 4,7-dimethoxy 5-N-methylcarbamoylamino 6-(2-piperidino ethoxy) benzofuran. Code number: 750 819 1st step: 5-acetamido 4,7-dimethoxy 6-(2-piperidino ethoxy) benzofuran hydrochlorate. Code number: 740 745

A mixture of 25.1 g (0.1 mole) of 5-acetamido 4,7-dimethoxy 6-hydroxy benzofuran, 22.2 g (0.15 mole) of 2-piperidino chlorethane and 41.6 g (0.3 mole) of potassium carbonate in 250 ml of acetone was brought to reflux for 2 hours. Then it was filtered, the solvent evaporated, the residue obtained was taken up again in acetone and 20 ml of 7 N hydrochloric ethanol were added. It was filtered and recrystallized in 400 ml of propanol.

Melting point: 260° C.

Yield: 33%

Empirical formula: C₁₉ H₂₇ ClN₂ O₅

Elementary analysis:

    ______________________________________                                                     C       H         N                                                ______________________________________                                         Calculated (%)                                                                               57.21     6.82      7.02                                         Obtained (%)  57.35     7.03      7.08                                         ______________________________________                                    

2nd step: 5-amino 4,7-dimethoxy 6-(2-piperidino ethoxy) benzofuran dichlorhydrate. Code number: 740 778

A solution of 25.1 g (0.1 mole) of 5-acetamido 4,7-dimethoxy-(2-piperidino ethoxy) benzofuran prepared in the previous step, in 200 ml of 2 N hydrochloric acid, was brought to reflux for 10 hours. Then it was neutralized with concentrated soda, extracted with ethyl acetate, the solvent was evaporated, the residue was taken up again in acetone and 30 ml of 7 N hydrochloric ethanol were added. It was filtered and recrystallized in ethanol.

Melting point: 203° C.

Yield: 43%

Empirical formula: C₁₇ H₂₆ Cl₂ N₂ O₄

Elementary analysis:

    ______________________________________                                                     C       H         N                                                ______________________________________                                         Calculated (%)                                                                               51.48     6.74      6.91                                         Obtained (%)  51.72     6.63      6.81                                         ______________________________________                                    

3rd step: 4,7-dimethoxy 5-N-methylcarbamoylamino 6-(2-piperidino ethoxy) benzofuran. Code number: 750 819

A mixture of 16 g (0.05 mole) of 5-amino 4,7-dimethoxy 6-(2-piperidino ethoxy) benzofuran prepared in the preceding step and 3.2 ml (0.055 mole) of methyl isocyanate was brought to 80°-90° C. for 3 hours, in an autoclave, in 500 ml of toluene. Then the solvent was evaporated, the oil obtained was crystallized in petroleum ether and recrystallized in propylic ethanol.

Melting point: 120° C.

Yield: 37%

Empirical formula: C₁₉ H₂₇ N₃ O₅

Elementary analysis:

    ______________________________________                                                     C       H         N                                                ______________________________________                                         Calculated (%)                                                                               60.46     7.21      11.13                                        Obtained (%)  60.42     7.29      11.30                                        ______________________________________                                    

EXAMPLE 6: 5-acetamido-6-(2-chloro ethoxy) 4,7-dimethoxy benzofuran. Code number: 750 885

A solution of 25.1 g (0.1 mole) of 5-acetamido 4,7-dimethoxy 6-hydroxy benzofuran in 15 ml of a 50% aqueous solution of soda was brought to 90° C. and 21 g (0.1 mole) of 2-chloro ethanol tosylate was slowly added, it was ketp at 90° C. for 2 hours, diluted in 1 l of water, filtered and recrystallized in ethanol.

Yield: 37%

Melting point: 180° C.

Empirical formula: C₁₄ H₁₆ ClNO₅

Elementary analysis:

    ______________________________________                                                     C       H         N                                                ______________________________________                                         Calculated (%)                                                                               53.59     5.14      4.46                                         Obtained (%)  53.41     5.21      4.75                                         ______________________________________                                    

EXAMPLE 7: 5-acetamido 4,7-dimethoxy 6-(4-methyl piperazino ethoxy) benzofuran hydrated dichlorhydrate. Code number: 750 934

A solution of 15.5 g (0.05 mole) of 5-acetamido 6-(2-chloro ethoxy) 4,7dimethoxy benzofuran prepared in the preceding example and 15 g (0.15 mole) of N-methyl piperazine was brought to reflux for 8 hours in 100 ml of toluene. It was filtered and the filtrate evaporated under vacum the residue was taken up again in alcohol and hydrochloric alcohol was added. It was filtered and recrystallized in absolute alcohol.

Yield: 55%

Melting point: 160° C.

Empirical formula: C₁₉ H₂₉ Cl₂ N₃ O₅ +9/4H₂ O

Elementary analysis:

    ______________________________________                                                     C       H         N                                                ______________________________________                                         Calculated (%)                                                                               46.48     6.88      8.56                                         Obtained (%)  46.76     6.73      8.34                                         ______________________________________                                    

It should be noted that with the process of the 2nd step of example 1, but using the corresponding reagents, 6-(3-chloro propoxy) 4,7 dimethoxy 5-N-methylcarbamoyl-amino benzofuran was obtained, code No. 770 564, having the following characteristics:

Melting point: 162° C.

Empirical formula: C₁₅ H₁₉ ClN₂ O₅

Rmn spectrum (δ ppm-DMSO):

7.92 and 7.03, d, (J=3 Hz)-2benzofurannic protons,

7.11, s, 1 urea proton: ##STR48## 5.98, d, (J=5 Hz), 1 urea proton: --N--CO--NH (--CH₃)

3.85 and 3.96, s, 6 protons (2 CH₃ O--)

centred on 3.92, m, 4 protons, ##STR49## centred on 2.10, m, 2 protons, ##STR50## 2.63, d, (J=5 Hz), 3 protons ##STR51##

With the process of the third step of example 1, but using the corresponding reagents, the compounds of code numbers 770,602, 770,577 and 770,578 are obtained, they are shown in Table I below.

With the process of example 2 using the corresponding reagents the compound of code 750,819 is obtained.

Likewise, with the process of the first step of example 5 and using the corresponding reagents, the compounds are obtained of code numbers 750,725, 750,761, 750,762, 760,886, 760,887, 750,732 and 770,191 shown in table II below.

With the process of the second step of example 5 and using the corresponding reagents the compounds of formula (XVIII) are obtained for which:

m has the value 1 and ##STR52## represents a dimethylamino, diethylamino, pyrrolidino, hexamethyleneimino or heptamethyleneimino group, and

m has the value 2 and ##STR53## represents the piperidino radical, as well as the compound of code number 760,618 for which m has the value 1 and ##STR54## represents the 4-methyl piperazino group having the following characteristics:

Melting point: 62° C.

Yield≃100%

Empirical formula: C₁₇ H₂₅ N₃ O₄

Elementary analysis:

    ______________________________________                                                     C       H         N                                                ______________________________________                                         Calculated (%)                                                                               60.87     7.51      12.53                                        Obtained (%)  60.56     7.62      12.67                                        ______________________________________                                    

    TABLE I       ##STR55##                 CodeNo.       ##STR56##       ##STR57##       R.sub.5 m Empiricalformula Molecularweight Meltingpoint(°C.)      Yield(%) Elementary analysisCalculated (%)Obtained (%)CHNCHN                      760 677 NH-Et       ##STR58##       H 1 C.sub.20 H.sub. 29 N.sub.3 O.sub.5 391.46 112° 83 61.36 7.47      10.74 61.29 7.63 11.11 770 206 NHCH.sub.3       ##STR59##       " " C.sub.16 H.sub.23 N.sub.3 O.sub.5 337.37 143° 53 56.96 6.87      12.46 56.74 6.59 12.43 770 193 NHCH.sub.3       ##STR60##       " " C.sub.18 H.sub.27 N.sub.3 O.sub.5 365.42 134° 58 59.16 7.45      11.50 59.05 7.43 11.68 770 266 "       ##STR61##       " " C.sub.20 H.sub.31 N.sub.3 O.sub.5 393.47 142° 77 61.05 7.94      10.68 61.22 7.94 10.62 770 207 "       ##STR62##       " " C.sub.18 H.sub.25 N.sub.3 O.sub.5 363.40 116° 37 59.49 6.93      11.56 59.17 6.77 11.        760 954 "      ##STR63##       " " C.sub.20 H.sub.29 N.sub.3 O.sub.5 390.45 130° 61 61.36 7.47      10.74 61.43 7.38 10.77 760.989 "       ##STR64##       " " C.sub.21 H.sub.31 N.sub.3 O.sub.5 405.48 122° 64 62.20 7.71      10.36 61.90 7.51 10.44 770 422 "       ##STR65##       CH.sub.3 " C.sub.20 H.sub.29 N.sub.3 O.sub.5 391.46 147° 50      61.36 7.47 10.74 61.15 7.73 10.58 760 955 " " H 2 C.sub.20 H.sub.29      N.sub.3 O.sub.5 391.46 137° 59  "  "  " 61.21 7.60 10.60 760 722      NHCH.sub.3       ##STR66##       H 1 C.sub.19 H.sub.28 N.sub.4 O.sub.5 + H.sub.2 O 410.46 118° 80      55.59 7.37 13.65 55.48 7.08 13.93 770 201 "       ##STR67##       " " C.sub.20 H.sub.29 N.sub.3 O.sub.5 391.46 133° 75 61.36 7.47      10.74 61.04 7.34 10.89 770 336       ##STR68##       ##STR69##        " "    " 391.46 114° 50  "  "  " 61.41 7.43 10.58 770 602      NHCH.sub.3 NHCH.sub.3 " " C.sub.15 H.sub.21 N.sub.3 O.sub.5 336.85      147° 62 53.48 6.73 12.48 12.45. 3/4H.sub.2 O 6.35 12.45 770 576 " N      HC.sub.3 H.sub.7 iso " " C.sub.17 H.sub.25 N.sub.3 O.sub.5 351.39      140° 48 58.10 7.17 11.96 57.89 7.11 11.86 770 577 "       ##STR70##       " " C.sub.20 H.sub.29 N.sub.3 O.sub.5 391.46 135° 60 61.36 7.47      10.74 61.18 7.41 10.43 770 578 "       ##STR71##       " " C.sub.19 H.sub.25 N.sub.3 O.sub.5 375.41 128° 78 60.78 6.71      11.19 60.66 6.68 10.99 770 520       ##STR72##       ##STR73##       " " C.sub.23 H.sub.34 N.sub.4 O.sub.5 446.53 138° 35 61.86 7.68      12.55 61.63 7.70 12.33 750 819 NHCH.sub.3       ##STR74##       " " C.sub.19 H.sub.37 N.sub.3 O.sub.5 377.43 120° 37 60.46 7.21      11.13 60.42 7.29 11.30

                                      TABLE II                                     __________________________________________________________________________      ##STR75##                                                                      Code No.                                                                           ##STR76##   Form   m                                                                                Empirical  formula                                                                     Molec- ular weight                                                                 Melt- ing point (°C.)                                                       Yield (%)                                                                          Elementary analysis                                                           Calculated (%)Obtained (%)        __________________________________________________________________________                                                  CH C                              740 745                                                                             ##STR77##  chlorhydrate                                                                          1 C.sub.19 H.sub.27 ClN.sub.2 O.sub.5                                                    398.88                                                                             260°                                                                        33  57.21                                                                             6.82                                                                              7.02                                                                              57.35                                                                             7.03                                                                              7.08               750 725                                                                             ##STR78##  methane sulfonate                                                                     " C.sub.19 H.sub.28 N.sub.2 O.sub.8 S                                                    444.49                                                                             148°                                                                        60  51.34                                                                             6.35                                                                              6.30                                                                              51.42                                                                             6.38                                                                              6.37               750 761                                                                             ##STR79##  chlorhydrate  + H.sub.2 O                                                             " C.sub.16 H.sub.25 ClN.sub.2 O.sub.6                                                    376.83                                                                             110°                                                                        40  50.99                                                                             6.69                                                                              7.43                                                                              51.13                                                                             6.61                                                                              6.97               750 762                                                                             ##STR80##  meth- ane sulfo- nate + H.sub.2 O                                                     " C.sub.19 H.sub.32 N.sub.2 O.sub.9 S                                                    464.53                                                                              85°                                                                        42  49.12                                                                             6.94                                                                              6.03                                                                              48.87                                                                             6.94                                                                              5.82               750 732                                                                             ##STR81##  methane sulfonate                                                                     2 C.sub.21 H.sub.35 N.sub.2 O.sub.8 S                                                    472.55                                                                             188°                                                                        65  53.37                                                                             6.83                                                                              5.93                                                                              53.36                                                                             7.13                                                                              5.7                760 886                                                                             ##STR82##  chlorhydrate                                                                          1 C.sub.20 H.sub.29 ClN.sub.2 O.sub.5                                                    412,90                                                                             218°                                                                        80  58.17                                                                             7.08                                                                              6.79                                                                              58.06                                                                             7.12                                                                              6.87               760 887                                                                             ##STR83##    "    " C.sub.21 H.sub.31 ClN.sub.2 O.sub.5                                                    426.93                                                                             189°                                                                        67  59.08                                                                             7.32                                                                              6.56                                                                              58.92                                                                             7.47                                                                              6.57               770 191                                                                             ##STR84##  chlorhydrate  + 3/5 H.sub.2 O                                                         " C.sub.20 H.sub.28 N.sub.2 O.sub.5 + 3/5 H.sub.2                                O       423.71                                                                             170°                                                                        79  56.69                                                                             7.18                                                                              6.61                                                                              56.45                                                                             7.24                                                                              6.34               750 934                                                                             ##STR85##  di- chlorhydrate + 9/4 H.sub.2 O                                                      " C.sub.19 H.sub.27 N.sub.3 O.sub.5 + 9/4 H.sub.2                                O       490.90                                                                             160°                                                                        55  46.48                                                                             6.88                                                                              8.56                                                                              46.76                                                                             6.73                                                                              8.34               __________________________________________________________________________

the compounds of formula (I) of the invention have been studied on laboratory animals and showed antidysrhythmic properties.

Two tests brought out these properties.

1st test

The compounds of formula (I) inhibit for more than 30 minutes a ventricular tachycardia induced by an overdose of ouabain in a dog anaesthetized with sodic pentobarbitol (30 mg/kg./i.v;)

The results obtained with several of them, as well as the results obtained with reference substances (ajmaline, quinidine, procainamide, diisopyramide and amiodarone) well known for their antidysrhythmic activity are shown in Table III below.

It is to be noted that the tested compounds are injected intravenously 30 minutes after establishment of the stability of the ventricular tachycardia.

                  TABLE III                                                        ______________________________________                                                       Ventricular tachycardia induced                                                in a dog by ouabain                                                              Dose re-establishing                                           Compound        the sinusal rhythm                                                                           Duration of                                      tested          (mg/kg/i.v.)  effect (min.)                                    ______________________________________                                         According to the invention:                                                    750 819         2.4           9 to 105                                         760 677         2             90 to 120                                        770 206         4             > 120                                            770 193         2             120                                              770 266         2             30 to 120                                        770 207         2             60                                               760 954         1             120                                              760 989         2             < 30                                             770 422         1             < 20                                             760 955         2             105                                              760 722         5             120                                              770 201         2             15 to 30                                         770 336         2             30                                               770 602         2             30                                               770 576         4             120                                              770 577         0.5           10                                               770 578         4             15 to 120                                        770 520         1             120                                              Reference:                                                                     QUINIDINE       8.8           30                                               PROCAINAMIDE    30            30                                               AJAMALINE       2.5           30                                               DIISOPYRAMIDE   5             30                                               AMIODARONE      inactive to 9                                                  ______________________________________                                    

2nd test

The compounds of formula (I) permit the sinusal rhythm to be reestablished in a wakeful dog with polymorphous ventricular dysrhythmia 24 hours after the ligature of the anterior interventricular artery according to the technique of Harris.

The results obtained with several of them, as well as the results obtained with reference substances (ajmaline, quinidine, procainamide, diisopyramide, amiodarone) well known for their antidysrhythmic activity, are given in Table IV below, the compounds listed being administered by slow intravenous injection of by mouth by forced feeding.

                                      TABLE IV                                     __________________________________________________________________________               Polymorphous dysrhythmia induced in a dog by                                   ligature of a coronary artery                                                  Dose   % re-establis-                                                                        Dose    % re-establis-                                 Compounds administered                                                                          hment of the                                                                          administered                                                                           hment of the                                   tested    (mg/kg/i.v.)                                                                          sinusal rhythm                                                                        (mg/kg/p.o.)                                                                           sinusal rhythm                                 __________________________________________________________________________     According to the                                                               invention                                                                      750 819   5      100    12.5   90                                              760 677   2      90                                                            770 206                                                                        770 193                                                                        770 266   2      30                                                            770 207   2      60                                                            760 954   2      50     12.5   80                                              760 989   2      100                                                           770 422                                                                        760 955   2       80 (1/3                                                                       of animals)                                                   760 722   5      50                                                            770 336   2      30                                                            Reference                                                                      QUINIDINE 10     42     25     25                                              PROCAINAMIDE                                                                             5      35     ≦60                                                                            Inactive                                        AJMALINE  2.5    25     25     35                                              DIISOPYRAMIDE                                                                            5      45     125    55                                              AMIODARONE                                                                               10     42     50     Inactive                                                         (48 hours)                                                    __________________________________________________________________________

As is clear from the results shown in Tables III and IV and from those appearing in Table V below, the difference between the pharmacologically active doses and the lethal doses is sufficiently large to allow the compounds of formula (I) to be used in therapeutics.

                  TABLE V                                                          ______________________________________                                         Compounds          50 lethal dose (mouse)                                      tested             (mg/kg/i.v.)                                                ______________________________________                                         According to the invention                                                     760 677            28                                                          770 206            100                                                         770 193            74                                                          770 266            52                                                          770 207            98                                                          760 954            31                                                          760 988            14                                                          770 422            30                                                          760 955            42.5                                                        760 722            145                                                         770 201            24                                                          770 336            25                                                          770 602            67                                                          770 576            49                                                          770 577            9.5                                                         770 578            72                                                          770 520            16                                                          750 819            56                                                          Reference                                                                      QUINIDINE          89                                                          PROCAINAMIDE       140                                                         AJMALINE           26                                                          DIISOPYRAMIDE      60                                                          AMIODARONE         150                                                         ______________________________________                                    

It should be noted moreover that most of the compounds of formula (I) have an antidysrhythmic activity equal to or greater than that of the reference compounds.

The compounds of formula (I) are indicated in disorders of the cardiac rhythm, as for example tachycardia.

They will be administered orally in the form of tablets, pills, capsules, containing from 1 to 200 mg of active ingrediant (2 to 6 per day) or parenterally in the form of injectable ampoules containing from 1 to 100 mg of active ingredient (1 to 4 per day). 

What we claim is:
 1. A compound having the formula ##STR86## wherein R₄ is methyl or ethyl, and ##STR87## is monoalkylamino wherein the alkyl has 1 to 3 carbon atoms, dialkylamino wherein the alkyls have 1 to 3 carbon atoms, or cycloalkylamino wherein the cycloalkyl has 5 to 6 carbon atoms.
 2. A compound according to claim 1 in which R₄ is methyl and ##STR88## is isopropylamino.
 3. A compound according to claim 1 in which R₄ is methyl and ##STR89## is diisopropylamino.
 4. A compound according to claim 1 in which R₄ is methyl and ##STR90## is dimethylamino.
 5. A compound according to claim 1 in which R₄ is methyl and ##STR91## is diethylamino.
 6. A compound according to claim 1 in which R₄ is methyl and ##STR92## is methylamino.
 7. A compound according to claim 1 in which R₄ is methyl and ##STR93## is monomethylamino, monoisopropylamino, monocyclohexaneamino, dimethylamino, diethylamino or diisopropylamino. 